Adjustable counterbalance pivot-crane.



W. VAN WIE. ADJUSTABLE UOUNTERBALANGE PIVOT CRANE. APPLIUATION FILED A311. 27/1908.

Patented Feb. 9, 1909.

' f .Z/aZZerMJW-Q Queuing i To all whom ii may concern:

WALTER VAN WIE, OF OAKLAND, CALIFORNIA.

AD JUESTABLE GOUN'IE EB ALANCE PIVOT-CRANE Specification of Letters Patent.

' Application filed April 27, 1908. Serial No. {129,549.

Be it known that I, WALTER VAN Win, a citizen of the United States, residing at Oakland, in the county of Alameda and State of California, have invented a new and useful Iin rovement in Adjustable Counterbalance ivot Cranes, of which the following is a specification.

This invention relates, to an adjustable counter balance pivot crane and is an improvement upon devices of this kind for which se arate applications have been made.

The offject of this invention is to provide a crane having a central pivotal point :upon which it swings vertically, and a rotatable upright standard carrying said crane, whereby the entire device maybe swung horizontally in acircle.

The invention consists of the novel features of construction hereinafter described, pointed out in the claims, and shown in the accompanying drawings, in which Figure 1 is a side elevation. Fig. 2 is an end elevation. Fig. 3 is a detail sectional view illustrating the construction of a beam and a traveling carriage. Fig. 4 is a detail perspective view illustrating a special gearing. Fig. 5 is a perspective view of a bracket.

In constructing this device I provide a vertically arranged rotatable standard 1 mounted at its upper and lower ends in suitable bearings of any desired kind, and a beam 2 is pivotally mounted midway its ends upon said standard. I prefer to form this beam in two parallel sections as shown in Fig. 3, a section of the beam being pivotally arranged upon opposite sides of the standard 1. The beam 2 however could be formed in one piece longitudinally slotted if so desired. To one free end'of this beam is secured a hoisting chain 3 byineans of which the work or other article to be lifted is engaged. To the other end of the beam is secured a cable 4 which runs over a pulley 5 mounted in the upper portion of the upright 1, and from said pulley'the cable 4 passes downwardly between the two sections of the beam 2 and in position to be engaged by a hook 6 carried atthe upper'end of a threaded rod 7 which rod works upwardly through a threaded opening 7 a in an angle plate or bracket 8 secured to one side of the standard 1. An operating handle 9 is secured upon the lower end of the rod 7. The front edge of the bracket 8 is notched at. 8*, said notch being just large enough to receive one link of the chain forming a part of the cable 1, but not large enough to permit said chain to run through the notch.

Upon-the rear end portion of the beam 2 is mounteda traveling carriage or truck 10 Patented Feb. 9, 1909.

which travels upon the beam and may be of any desired construction. This carriage is provided with the usual threaded feed rod 11 and nut 12 through which the rod works. A

counter balance weight 13 is carried by said traveling carriage 10 and is moved along the beam 2 by rotation ofthe feed rod 11. In order to rotate the rod 11 I form upon its forward end, or the end nearest the standard 1, a gear 14 whichconsists of a disk having upon its face a plurality of sockets-15. An operating shaft 16 has a handle 16 at its lower end and works loosely and slidably in a guide bracket 17 carried by the standard 1. The upper end portion of the shaft 16 passes through a metal plate 18 carried by the beam 2, .and carries at its upper end a toothed gear 19, the teeth of which are in the form of pins which pins engage the sockets 15 ofthe gear 14. In order that the gears will always mesh no matter what position the beam 2 is thrown into I slot the plate 18 as shown at 20 so that the shaft 16 can move longitudinally with respect to said plate, and I fix loosely upon the shaft 16 imme diately above the plate 18 a collar 21 to which is secured the end portion of a spring 22, the other end being fixed to the plate 18, and the spring being bent upon itself between its ends. Pins 23 are arranged on the plate 18 upon opposite sides of the spring 22 to guide the movement of the spring, the construction being such that the spring will always tend to force the shaft 16 along the slot 20 and hold the gear 19 in engagement with the gear 14:. Owing to the tilting of the beam 2 the gears will mesh at various angles, and it is therefore necessary to allow for considerable play between them.

The operation of the device is as follows The article to be lifted is attached to the hoisting chain 3 and by operating the handle 16 the plate 12 is run out toward the rear end of the beam 2 until it overbalances the weight of thearticle which when it is ascended to the desired height may be locked in said position by engaging the hook 6 with a link of the chain forming a part of the cable 4:. This hook can be adjustable by means of the handle '9 and threaded rod 7. The

entire device can then be swung horizontally by rotation of the standard 1 and when the article is in position above the place upon which it is to be deposited the hook 6 is disengaged from the cable a and the weight 13 run back toward the standard 1 thus permitting the weight to descend. The hook 6 may then be again en "aged with the cable .L and the hoisting chain 3 disengaged from the work. This leaves the weight 18 in position for further use, the weight end of the beam 2 being held elevated by engagement of the cable 4: with the hook 6. If at any the it is desired to obtain a new grip by the hook 6 upon a link of the chain of the cable l, in order to relieve the chain 3 of any weight or strain so that it can be readily disengaged, a link of the chain of the cable can be slipped into the notch 8 which will ice I the parts in position, and by means of the handle 9 the rod 7 can be run higher up for c igagement with a new link, and by then reversing rotation of said handle and red the elevated or weight end i the b am 2 will be slightly lifted thus causing a slight slack in the chain 3, so that it can be easily disengaged from the work.

Having thus fully described my invention, What I claim as new and desire to Letters Patent is 1. A device of the kind described comprising a rotatable standard, a beam pivota ly mounted midway its ends upon said standard, a hoisting chain carried by one end of said beam, an adjustable weight traveling along the opposite end portion of the beam, a pulley carried b the standard, a cable running over said pulley, one end of the cable being connected to the weight end of the beam, and means carried by the standard for engaging a portion of the last mentioned cable.

2. A device of the kind described comprising a vertically swinging and horizontally rotatable beam, a traveling carriage mounted thereon, a threaded feed rod for moving said carriage, a gear wheel consisting of a disk having sockets formed in its face, said gear being mounted upon said feed rod, a versecure by tically extending operating shaft, a gear carried by the upper end of said shaft said gear having teeth engaging the sockets of the first mentioned gear, a plate carried by the beam and slotted, the operating shal t passing through said slot, a collar fixed loosely upon said shaft, a spring secured at one end to said collar and at the other end to the plate adapted to force said operating shalt along the slot and into engagement with. the first mentioned gear, as and for the purpose set forth.

3. A device of the kind described comprising a rotatable standard, a beam pivotally mounted midway its ends upon said standard, said beam swinging vertically independent of rotation of the standard, a carriage movable upon said beam, a counter balance w eight carried by the carriage, a feed rod carried by the beam and operating said carriage, a vertically arranged operating shaft for driving said feed rod, a guide bracket carried by the standard, the operating shalt being slidably held in said bracket, a pulley carried by the standard, a cable secured to the weight end of said beam and running over the pulley, a verti ally adjustable hook for engagement with links of the cable, and a hoisting chain carried by the free end of the pivot beam.

In a dev'ce ol the kin d described a vertically swinging beam, a traveling carriage thereon, a counter balance weight supported by said carriage, threaded l'eed rod operating said carriage, a slotted plate carried by the beam, a guide bracket arranged below said beam, an operating shalt slidably held in the guide brac ct and passing loosely through the slot of the plate, intcrmeshing gears carried by the feed rod and. the operating shal't and spring carried by the slotted plate, said spring holding the stud gears in. engagement during swinging movement of tue beam.

'VAljlElt VAN ll' ll l fitnesses:

A. C. llAniiiiLL, N. ll. BALD'WIN. 

